EP 1930177 A4 20101229 - PROJECTION BLACKBOARD AND PROCESS FOR PRODUCING THE SAME
Title (en)
PROJECTION BLACKBOARD AND PROCESS FOR PRODUCING THE SAME
Title (de)
PROJEKTIONSTAFEL UND VERFAHREN ZU DEREN HERSTELLUNG
Title (fr)
TABLEAU NOIR DE PROJECTION ET PROCESSUS DE FABRICATION IDOINE
Publication
Application
Priority
- JP 2005021772 W 20051128
- JP 2005254586 A 20050902
Abstract (en)
[origin: EP1930177A1] Problem Provided are a projection blackboard having both of an excellent blackboard function and an excellent screen function, and a process for producing the same. Solving means The surface enamel layer that is an outermost layer of the enamel layers is formed by using a enameling upper glaze wherein at least titanium oxide coated particles, or a titanium oxide glaze together therewith is blended into a transparent mat glaze, so as to render the layer an enamel layer having a predetermined color tone, a surface characteristic that the Rz is from 5 to 25 µm and a reflective characteristic that the peak gain is 0.28 or more, or having these properties and a glossiness Gs (75°) of 1 to 30%. This makes it possible to produce a blackboard excellent in both of blackboard function and screen function. The titanium oxide coated particles are preferably particles wherein surfaces of mica particles are coated with titanium oxide. The metallic substrate is preferably a cold-rolled steel sheet, an aluminum plated steel sheet, or a Zn-A1 alloy plated steel sheet.
IPC 8 full level
B43L 1/04 (2006.01); B43L 1/10 (2006.01); G03B 21/60 (2006.01)
CPC (source: EP US)
B05D 3/0209 (2013.01 - US); B43L 1/04 (2013.01 - EP US); B43L 1/10 (2013.01 - EP US); G03B 21/60 (2013.01 - EP US); Y10T 428/12535 (2015.01 - EP US); Y10T 428/12618 (2015.01 - EP US); Y10T 428/12993 (2015.01 - EP US)
Citation (search report)
- [IA] WO 0237409 A1 20020510 - POLYVISION NV [BE], et al
- [I] DE 2749402 A1 19790510 - DONG SEO IRON WORKS CO
- [A] US 2264244 A 19411125 - LYTLE WILLIAM O
- [A] US 1434989 A 19221107 - BROOKS GEORGE W
- See references of WO 2007029351A1
Designated contracting state (EPC)
BE
DOCDB simple family (publication)
EP 1930177 A1 20080611; EP 1930177 A4 20101229; EP 1930177 B1 20140702; CN 100591531 C 20100224; CN 101258040 A 20080903; TW 200709956 A 20070316; TW I359748 B 20120311; US 2009155759 A1 20090618; US 2013216715 A1 20130822; US 8470451 B2 20130625; US 9168566 B2 20151027; WO 2007029351 A1 20070315
DOCDB simple family (application)
EP 05809636 A 20051128; CN 200580051475 A 20051128; JP 2005021772 W 20051128; TW 94145916 A 20051222; US 201313849986 A 20130325; US 6551008 A 20080317